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Rock and roll is a genre of popular music that evolved in the United States in the late 1940s after World War II, from a combination of the rhythms of the blues, from the African American culture, and from America's country music and gospel music scene. Though elements of rock and roll can be heard in country records of the 1930s, and in blues records from the 1920s, rock and roll did not acquire its name until the 1950s. An early form of rock and roll was rockabilly, which combined country and jazz, with influences from traditional Appalachian folk, and Gospel music. Rock and roll can trace one lineage to the Five Points, Manhattan district of mid-19th century in New York City, the scene of the first fusion of heavily rhythmic African shuffles and sand dances, with melody-driven European genres, particularly the Irish and Italian jig.
The term "rock and roll" now covers at least two different meanings, both in common usage. The American Heritage Dictionary and the Merriam-Webster Dictionary both define rock and roll as synonymous with rock music. Conversely, Allwords.com defines the term to refer specifically to the music of the 1950s. For the purpose of differentiation, this article uses the latter definition, while the broader musical genre is discussed in the rock music article.
Classic rock and roll is usually played with one or two electric guitars (one lead, one rhythm), a string bass or (after the mid-1950s) an electric bass guitar, and a drum kit. In the earliest rock and roll styles of the late 1940s and early 1950s, either the piano or saxophone was often the lead instrument, but these were generally replaced or supplemented by guitar in the middle to late 1950s. The beat is essentially a boogie woogie blues rhythm with an accentuated backbeat, the latter almost always provided by a snare drum.
The massive popularity and eventual worldwide view of rock and roll gave it a unique social impact. Far beyond simply a musical style, rock and roll, as seen in movies and in the new medium of television, influenced lifestyles, fashion, attitudes, and language. It went on to spawn various sub-genres, often without the initially characteristic backbeat, that are now more commonly called simply "rock music" or "rock".
Source : http://en.wikipedia.org/wiki/Rock_and_roll